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FUNCTION PROCESSPLAYERMOVES()

`PLAYER ONE USES SHIFT KEY TO MOVE UP

IF SHIFTKEY()
DEC PADDLEY2, 3 `DECREMENT VERTICAL COORDINATE BY 3PX
`DO NOT LET PADDLE GO PAST TOP OF SCREEN
IF PADDLEY2 < 0 THEN PADDLEY2 = 0
ENDIF
`PLAYER ONE USES CONTROL KEY TO MOVE DOWN
IF CONTROLKEY()
INC PADDLEY2, 3 `INCREMENT VERTICAL COORDIANTE BY 3PX
`DONT ALLOW TO GO PAST BOTTOM OF SCREEN
IF PADDLEY2 > 405 THEN PADDLEY2 = 405
ENDIF

`PLAYER 2 USES UP KEY TO MOVE UP
IF UPKEY()
DEC PADDLEY1, 3
IF PADDLEY1 < 0 THEN PADDLEY1 = 0
ENDIF

`PLAYER 2 USES DOWN KEY TO MOVE DOWN
IF DOWNKEY()
INC PADDLEY1, 3
IF PADDLEY1 > 405 THEN PADDLEY1 = 405
ENDIF

ENDFUNCTION

FUNCTION UPDATEBALLPOSITION()

INC BALLX, 3 `speedx

INC BALLY, 1 `speedy

ENDFUNCTION

function processPlayerMoves()
	// player one controls
	if shiftkey() and paddleOneY >= 3 then dec paddleOneY, 3
	if controlkey() and paddleOneY <= 402 then inc paddleOneY, 3

	// player two controls
	if upkey() and paddleTwoY >= 3 then dec paddleTwoY, 3
	if downkey() and paddleTwoY <= 402 then inc paddleTwoY, 3
endfunction

function processPlayerMoves()
	// player one controls
	if paddleOneY >= 3
		if shiftkey() then dec paddleOneY, 3
	endif
	if paddleOneY <= 402
		if controlkey() then inc paddleOneY, 3
	endif

	// player two controls
	...
endfunction

global v = 5					// set v to 5.
if 0 and myFunc() : endif		// have a condition that calls a function that changes v, after a condition that resolves to false and thus means the if won't fire.
print v							// v has been modified, and so the function was called regardless.
sync : nice wait key : end

function myFunc()
	v = v * 2
endfunction 0

global kShift, kCtrl
kShift = shiftkey()
kCtrl = controlkey()

...

function processPlayerMoves()
        // player one controls
        if kShift
                if paddleOneY >= 3 then dec paddleOneY, 3
        endif
        if kCtrl
                if paddleOneY <= 402 then inc paddleOneY, 3
        endif

        // player two controls
        ...
endfunction